|
|
|
|
| Author |
|
|
Registered
Join Date: Dec 2004
Location: san jose
Posts: 4,982
|
porting a 964
When I look into the ports of my 964 heads, there appears to be some ceramic material used to make a smooth entrance. A few ports have some of it missing. Anyone know how I can rework back to spec? thanks
|
||
02-18-2005, 10:43 AM
|
|
|
Moderator
|
The cast in ceramic inserts are notorious for cracking and braking up. AFAIK there isn't much you can do to rectify the situation. If you insist on identical exhaust port configs you will need to break out the intact ones then port to suit.
The design intent of the inserts is to keep heat out of the head. They do work well in that role when intact.
__________________
Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
||
|
02-18-2005, 11:01 AM
|
|
|
I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
|
Parallel with this subject... Could you substitute a ceramic thermal barrier coating instead of the inserts? Sort of like Jet-Hot on the inside.
Any experience with these coatings?
__________________
Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
||
|
02-18-2005, 11:16 AM
|
|
|
Super Moderator
|
Innerestin' idea Jamie!
__________________
Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
||
|
02-18-2005, 03:54 PM
|
|
|
Registered
Join Date: Mar 2003
Location: Oklahoma
Posts: 2,391
|
Cermaic coating is what the factory uses. If the coating is chipping that means the engine has gotten too hot. It will not hurt anything if the coating is gone
Eric Hood |
||
|
02-21-2005, 09:30 PM
|
|
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
1970 Porsche 911 S 
